Warp stop motion for looms



Mmh 1o. 192,5. 4 A 1,529,027

\ s. B. LAWRENCE WARP STOP MOTI ON "FOR LOOMS Filed Feb. 12, 1924 N /Nl/f/VTOR.' C25/4 Y I do 3l 4 E y BY nz' 9v@ I* ATTORNEY Patented Mar. 10, 1925.

UNITED STATES PATENT `0FFiCB SAM B. LAWRENCE, OF ANDERSON, SOUTH CROLNA., .ASSGNOB T0 DRAPER CORq PORATION, OF HOPEDALE, LIASSACHUSETTS, A CORPORATON 0F MAINE.

WARE' yS'IOP MOTION FOR LOOliS.

' Application filed February 12, 1924. Seria-l No. 692,210.

To all whom it may concern; t

Be it known that L SAM B. LAWnENoE, a citizen of the United States, Land resident oi' Anderson 7 in the county .ot Anderson vand State of South Carolina, have invented -an improvement in Vlarp Stop Motions for Looms, ofY whichy the following description. in connection with the accompanying drawings, is a specification, like lcharacters on the drawings representing like parts. Y

This invention relates to warp` stop mecl'ianisms tor looms whereby the operation of the loom is arrested when a warp thread breaks or. becomes toosla'ck for weaving purposes. v i

As now ordinarily constructed, vwa ip .stop

mechanisms arel providedwvithxa series of drop wires which `are normally supported by a warp thread during weaving, land yassociated with the drop wires there is .al dro wire guide for directing :the movement o the drop wires. A feeler or vibratork is usually associated with thewarp stop mechanism and has its movement arrested when one or more of the drop wires tail to be supported by the warp threads during weaving.

and Ysuch arrest ofthe teeler or Vibrator isV utilized. in stoppingthe loom.

During the weaving .operation the drop wire guidesare moved intheir supports Aas the shedding lmechanism changes the` shed, the result being that the -drop wire guides wear rapidly at their supported ends and have to be renewed frequently. Moreover,

when the warp in .a loom is to be changedV it is easier to remove the drop wires while still connected with their warp' threads, tie the lease inthe warp ,threads and .draw the new warp threads .through the `drop wires b v tying them to the ends of the old warp threads and withdrawing the old threads. It is thus desirable to support the drop wire guides, which usually pass throughslots in tliedropr wires, so that they may be readily removed from the loom, andQconseqnently the end supports for the drop wire guides are usually formed with openbearings for the ends ot the drop wire guides.

The present invention has for one rotts objects the provision of means for holding the drop wire guides in their end bearings without movement and to readily relieve :the

ends ot the drop wireguid'es when 'they are to be removed. v

An important feature ot' the V.present invention, therefore consists in end supports tor the .drop wire guides .and a .retainer which is lnovabie into engagement with the ends of the dzrop wire guides tohold them immovable in their supports and is .removable frroin its voperative position .to readily permit the removal ot the :drop wire guides.

The vnovel teaturesiot the invention and new combination of `parte will best :be made clear fromA the. following .description `and the Aaccompanying drawings of one good form of the invention.

In the drawings:

Fig. 1 is a perspective view of; the main parts ot `a warp stop mechanism, only .one end portion ot said mechanism .being shown, it being understood that the 4,opposite ^end portion is, or may be,..ot substantially .the same construction;

Fig. 2 is an enlarged perspective view showing the drop wire guide retainer withdrawn trom its retaining position to permit thedrop wire ,guide to be readily removed trom its supports;

Fig. 3 is a cross-section of the warp lstop mechanism `and adjacent onek end thereo; and F ig. 4 is an enlarged cross-sectionzonthe line 4--4 of Fig. 3.

It has not been deemed necessary herein to show and describe the "transmission mechanism for effecting :loom stoppagewhen the teeler or vibrator `is arrested-by a drop wire, since such mechanism .isnow understood and the details thereof form noxessen tial part vof the present invention.

Adjusta'bly mounted -at 'each side of the loom trame ll is a bracket -2 which lmay be secured in place by a bolt' passing .through a slot et in the bracket, suchv bracket 'forur ing a convenient.support tor the main portions ot the warp stop mechanism.

Each ot the 'brackets ,2, one at each side ot the loom, has a down-turned"portion 5 from which extend the supports 6 Vfor the rock shaft 7. The rock shaft 7 lis given a rocking or oscillating movement by suitable connections witha going part'of the loom through the rod 8 connected at 9 to an arm l0 secured to the rock shaft. Supported ron the rock shaft as by the arm il, one et which is shown, is a teeler bar 12 which eX- tends transversely'ot the loom trame, yand. is

low the drop Wires.

Extending upwardly from the bracket 2 is a slotted member 13, one at each side of the loom, into the slot of which extends an end of a warp support 14, in the present instance, and such warp support is held in its slotted member by a pin 15 extending through the slotted end of the warp support. The slotted member 13 is located above the down-turned portion 5 of the bracket 2 and may either be supported thereon or by the transverse member 16 which may itself be secured to the bracket by the lugs 17 and the usual securing bolts. The member 16 has the enlarged slotted end portions 18 into which extend the lease rods 19, one being shown at either side of the warp stop mechanism. The warp threads a extend from the warp beam towards the shedding mechanism and each alternate warp thread passes above and then below the lease rods 19, as usual, the crossing portion of the threads being preferably supported by the upper edge portion of the warp support 14.

The drop wires 20 are arranged in one or more roWs or banks and the drop wires of each row are supported by or hung upon the alternate warp threads a.

Extending between the down-turned portions 5 of the brackets 2 are the transverse bars 21 towards and from which the feeler or vibrator 12 moves during its oscillating movements, the construction being such that should one of the drop wires fail to be supported by its warp thread, it will move into position between the lower edge of one of the bars 21 and the oscillating member or feeler 21 and arrest the movement of theL latter, whereupon the loom will be stopped through any usual form of stop mechanism.

The parts of the warp stop vmotionthus far described may be of any usual or desired construction, that shown and described herein being illustrative of one good practical form thereof.

n the present instance of the invention, the drop wires 2 are shown as provided with the slots 22, the upper closed ends of which may properly be utilized for supporting the drop wires on their respective warp threads. Thilo this form of drop wire is well adapted for a warp stop motion, and for support of the drop wires upon the warp threads, they may be otherwise formed, various constructions and forms of drop wires being already well-known.

In the present instance, the drop wires 22 are guided in their movements by the drop wire guides 23 which, as shown, extend through the elongated slots 22 of the drop wires, and when the drop wires are properly supported by the warp threads the lower fclosed end portion of the elongated slots 22 may rest upon or be closely adjacent to the lower edge of each of the drop wire guides.

When the shed is changed, a portion of the warp thread is raised and another portion is lowered, with the result that the drop wire guides passing through the slots of the drop wires are alternately subjected to a lifting and lowering movement.

The down-turned portion 5 of the bracket 2 as shown is provided on its inner face with an open bearing2f'1 into which the end of drop wire guides project when in operative position, and in the slots 24 is formed a stop 25 constituting a rest for the lower edge portion of the end of the drop wire guides. In the present instance, the stops 25 are constituted as pins.

Mounted upon each of the brackets 2 which in the present instance constitute the end supports for the drop wire guides is a drop wire guide retainer, shown in the present instance as the slide 26 which is connned to sliding movement to and from operative position with respect to the ends of the drop wire guides. In the present instance the slide 2G has projecting from its under surface a lug 27, shown as of general cylindrical form, which is slidable in a guideway or groove 28 formed in the bracket 2, the construction being such that while the retainer 26 may be moved towards and from engagement with the ends of the drop wire guides resting in their open bearings, itis constrained to movement towards and from operative position.

The drop wire guide retainer or slide 26 is preferably provided with a thumb piece 29, F ig. 2, whereby the slide or retainer may be withdrawn from or moved to operative position. ln some instances it may be desirable to provide means for automatically moving the slide or retainer into operative engagement with the ends of the drop wire guides, and in the present instance such means is shown as a spring 30 which may be conveniently housed in a recess 31 formed in the bracket 2 and bearing at one end against the wall of the recess and at its other end against the projection 27 extending from the retainer, the construction being such that the retainer may be readily withdrawn from operative locking engagement with the ends of the drop wire guides to permit their ready removal when desired, and upon release of the retainer it will automatically move to automatic locking engagement with the ends of the drop wire guides. j

iVhere the drop wire guide retainer is constituted as a slide, as shown, it is desirable that movement of the retainer to and from operative position be limited, and to this end, as shown, the slide 26Y at each side thereof is provided with a slot 32 into which projects a stop or pin extending upwardly from the bracket 2, the construction being such that when the slide or retainer is withllO lil)

drawn` from its operative osition, .as indicated Vin F ig. .2, kthe .drop Wire guides .23 may be readily lifted from their open bearings in the-.endsupportsand when moved to operative yposition over the ends of the drop Wire guides they Will be limited in the eX- tent :of such .movement to @locate them in .operative position. n

From the construction described as one good embodiment of the present invention, it Will be apparent that when the drop wires 23 have their ends supported in the open bearings of the side supports or brackets, the slide or retainer 26 Will retain them immovable in such bearings by engagement, as shown, With the top surface of the drop Wire guides, so that all Wear of the ends oi' the drop Wire guides due to the movement of the Warp threads during Weaving is over'- come, and when the retainer or slide 26 is Withdrawn or moved from its engagement With the ends of the drop Wire guides, they may be readily removed from their open bearings along with the drop Wires.

lfn the Warp stop motion shown, tvvo banks ot drop wires and two drop Wire guides are illustrated, but it will be apparent that any number of banksof drop Wires and any number of drop- Wire guides may be employed. and it is equally apparent that instead of supporting4 the drop Wires upon the Warp threads by the Closed portion at the upper end of the elongated slots, they may be associated With the Warp threads by any of the usual means now employed in supporting` drop Wires upon the Warp threads. It will also be apparent that While the advantages of the present invention are manifested in the particular character of the Warp stop mechanism employed, the invention may be utilized in any other forms ot Warp stop mechanism wherein the drop wires are guided in their movements by drop Wire guides, the ends of which are supported in. bearings at the sides of the loom frame.

Vhat is claimed is:

l. In a warp stop mechanism for looms, the combination of a series of drop Wires, a drop Wire guide, a support at the side of the loom for the end of the drop Wire guide, a recess formed in the support constituting a guideway` and a retainer having a part extending into the guideway for directing the mjovement of the retainer to and from engagementwith the drop Wire guide.

2. ln a Wgarp stop mechanism for looms, the combination of a series of drop Wires nor rally supported by the Warp threads during Weaving, a drop Wire guide for guiding vthe drop wires, a lsupport at the side of the loom having a bearing for the end of the drop Wire guide, a sliding drop wire retainer on said support and having a lug confining the retainer to sliding movenient on the support into and out of engagement with the end of the `drop Wire guide.

3. In a Warp stop mechanism tor looms, the combination of aA series of drop Wires, a drop Wire guide, a brac-kethaving a guide- Way extending in a direction transversely of the loom, and a. sliding retainer mounted 'l'or movement in said guideway to and from engagement with the drop Wire guide.

4. In a warp stop mechanism for looms, the combination of a series of drop Wires normally supported by the warp threads during Weaving, a drop Wire guide for guiding the drop wires, a support at the side of the loom having` a bearing for the end of the drop Wire guide, a slidingr drop Wire retainer on said support and having` a lug confining the retainer to sliding movement on the support into and out of engagement with the end of the drop Wire guide. and a spring' acting upon the lug to slide the retainer into operative position.

5. In a Warp stop mechanism for looms, the combination oi a series of drop Wires, a drop Wire guide, a bracket having a groove extendingl in a direction transversely of the loom, and a sliding retainer mounted upon the bracket and having a lug engaging said groove to confine the retainer to sliding movement to and from operative position.

G. In a Warp stop mechanism for looms, the combination of a series of drop Wires, a drop Wire guide, a bracket having a groove extending in a direction transversely of the loom, a sliding retainer mjounted upon the bracket and having` a Vlug engaging said lgroove to confine the retainer to( sliding` movement to and 'from operative position, and a spring contained Within said groove to slide the retainer into engagement With the end of the drop Wire guide.

7. In a warp stop mechanism for looms, the combination of a series of drop Wires, a drop wire guide, a bracket having a groove extending` in a direction transversely of the loom. a sliding retainer mounted upon the bracket and having a lug engaging said groove to conne the retainer to sliding movement to and trom operative position, a spring contained Within said groove to slide the retainer into engagement with the end of the drop wire guide, and a stop Jfor limiting the sliding movement of the retainer.

8. In a Warp stop mechanism for looms. the combination of a series of drop Wires, a drop Wire guide, a bracket having a guide- Way extending in a direction transversely of the loom, and a sliding retainer mounted for movement in said guideway to and from engagement with the drop Wire guide and provided With a thumb piece for Slidthe retainer to and from operative po sition.

drop Wire guide, a bracket having a guide Way, a drop wire guide retainer constituted as a plate mounted for sliding movement upnon the bracket and engagingV the guide- Way, and a pin limiting the sliding movement of the plate.

ln testimony whereof, I have signed my name to this specification.

SAM B. LAWRENCE. 

